Sulfamethoxazole

Sulfamethoxazole (SMZ or SMX), is an antibiotic. It was used for bacterial infections such as urinary tract infections, bronchitis, and prostatitis and is effective against both gram negative and positive bacteria. It is now mostly used in combination with trimethoprim (abbreviated SMX-TMP). Other names include: sulfamethalazole, sulfisomezole, and sulfamethazole.Wikipedia

The FDA-approved drug label for sulfamethoxazole contains a precaution for the use of the drug in individuals who are G6PD-deficient due to the risk for hemolysis.

You carry a G6PD mutation that might lead to an unwanted side effect (hemolytic anemia) when taking sulfamethoxazole; due to variable expression (i.e. in females), enzymatic testing for G6PD activity is advisable.